What is the air scour rate which is provided before a water backwash?

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Question:What is the air scour rate which is provided before a water backwash?

1.12 cum/ sqm h

2.15 cum/ sqm h

3.20 cum/ sqm h

4.27 cum/ sqm h

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  1. What is the air scour rate which is provided before a water backwash?
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